On Wed, 18 Aug 2021 at 17:06, Andrea Aime <andrea.a...@geosolutionsgroup.com> wrote:
> Hi, > before we cut GeoServer 2.20.x I'd like to add all common tile matrix set > definitions to GWC, > as taken from the OGC Tile Matrix Set (TMS!) specification > <http://docs.opengeospatial.org/is/17-083r2/17-083r2.html>. > > They are named, in order: > > - WebMercatorQuad > - WorldCRS84Quad > - WorldMercatorWGS84Quad > - UTM##WGS84Quad > - UPSArcticWGS84Quad > - UPSAntarcticWGS84Quad > - EuropeanETRS89_LAEAQuad > - CanadianNAD83_LCC > > Per se this change only adds a bunch of new gridset to DefaultGridsets > <https://github.com/GeoWebCache/geowebcache/blob/main/geowebcache/core/src/main/java/org/geowebcache/config/DefaultGridsets.java>, > making it easier to set up a GeoServer that is better aligned with > standards. > +1 for me > it would add quite a bit of well-known gridsets to GWC... which would make > the WMTS capabilities document bigger. Maybe it's best if the WMTS > capabilities generator only outputs the gridsets that are actually used. > > This would also allow to follow suit with previous changes, and add to > each a 512px tile version, that has a "_x2" suffix. > > In terms of redundancy, the WorldCRS84Quad has a different number of zoom > levels compared to EPSG:4326, while WebMercatorQuad scale denominators are > slightly different than the ones in EPSG:900913 (first decimal is different > at zoom level 0) and the number of zoom levels is again different... so > neither would be an equivalent, these would be new grid sets. > > It would be nice to see the back of 900913 finally - or at least deprecate it and/or only allow people to switch it on using a flag? Ian
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